Here's the problem, I had a smaller cobra cb abd decided to move up. Both radios have incoming transmissions but when I try and talk to anyone they dont hear me, The antenna I have is a Fire cracker 1000 watt antenna. I had the smaller one working in my other truck (Freightliner century classic) I am now in a T-600 KW. I am at a loss here. Anyone who is a Trucker Knows thw value of having communacation with other truckers.
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You have to press the transmit button to get the radio to send a signal that you can calibrate the SWR meter to. If you are pressing the transmit button and nothing is happening then it could be a blown final transistor, a bad switch, bad microphone connection etc.
was it already installed or did you set it up ? If its a talk back that is an s.m.d. then it is usually controlled by the rf gain and the delta tune .Some will mount it to be controlled by the mic gain.Others try it out by attaching a resistor to the PA and external speaker plugs on the back of the radio. you may have to use a bigger resistor or even a smaller resistor to get it to work the way you want it to .
Had fixed the same problem yesterday. My cobra worked when it wanted to, when it didn't it looked like you explained. I found out that on my cobra the blue wire on the mike connector was broken. When it disconnects, no sound. after soldering, everything works fine.